From: ptkwt@... (Phil Tomson)
Date: 2004-07-16T13:52:17+09:00
Subject: Re: Do you want ":=" operator?

In article <cd7f3e$lmt@odbk17.prod.google.com>,
Xiangyu Yang <xiangyu.yang@gmail.com> wrote:
>>Right. But not all object states or values can be changed that way,
>>and there is no meaningful default operation for such a behaviour.
>>Thus, it makes more sense to use the appropriate #<< or #assign
>>mechanism.
>
>>-austin
>>--
>>Austin Ziegler * halxsxtaxuxx@gxxxxxxlx.cox
>>* Alternate: ausxin@hxaloxxtxxxuex.xa
>
>I can't use << and other operators, for they are all meaningful in my
>CPU model and have precedence problem. 

yes, usually these operators ('<<' and '>>' ) are used for shifting or 
rotating registers in hardware descriptions.  You can always define an 
'sl' or 'shift_left' method for your classes I suppose, but '<<' and '>>' 
are widely understood especially among Verilog programmers.

>And I can't force anybody to
>program "R0.assign(R0&R1)" for my CPU, otherwise I will be kicked to
>death. 

Yeah, hardware designers are a tough crowd ;-)

>I have to translate "Rx=..." to "Rx.assign ...", then eval the
>latter.

Wow, you're really serious about this ;-)

>The ":="  need not be supported by all classes. To use it or not, it's
>the programmer's choice.

Quite true.  

Phil